薄片状含硫酸ジルコニア微結晶の合成及び熱変化

概要

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A crystalline zirconium oxide sulfate compound with layer structure was synthesized by hydrothermal treatment of a mixture of zirconium hydroxide and sulfuric acid solution. The formation condition, crystallinity, composition and thermal changes of the compound crystals were investigated. It was found that the zirconium oxide sulfate layer compound is formed at temperatures above 150℃ and pH values below 2. The crystallinity of the compound increased with the increase of both H_2SO_4 concentration and heat-treatment temperature. The crystals had a thin platelike shape 200-700 nm in diameter and less than 20 nm in width, and those synthesized at 220℃ were sexangular. An electron diffraction pattern showed that there was α 6-fold symmetry axis in the direction perpendicular to the crystal with the lattice constant a equal to 0.63_2 nm obtained by assuming a face of the crystals, and on the assumption of being hexagonal lattice. The ratio Zr : SO^<2->_4 in the compound with high crystallinity was about three. The compound lost its interlayer water below 600℃, with the layer spacing decreased to a constant value of 1.04_8 nm. Then, the compound was desulfurized at about 650℃, resulting in metastable tetragonal or monoclinic ZrO_2 platelike skeletal grains.
社団法人日本セラミックス協会の論文
1987-05-01